package com.comleader.utils;

import java.util.HashMap;
import java.util.Map;

/**
 * 坐标转换工具类
 */
public class TransLocationUtil {
    private static double x_PI = 3.14159265358979324 * 3000.0 / 180.0;
    private static double pi = 3.1415926535897932384626D;// 圆周率
    private static double a = 6378245.0D;// WGS 长轴半径
    private static double ee = 0.00669342162296594323D;// WGS 偏心率的平方

    /**
     * 中国坐标内
     *
     * @param lat
     * @param lon
     * @return
     */
    public static boolean outofChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }

    public static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
                + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    // 84->gcj02
    public static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
                * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
                * pi)) * 2.0 / 3.0;
        return ret;
    }

    /****
     * 地球坐标转火星坐标
     * @param lon
     * @param lat
     * @return
     */
    public static Map<String, Double> transform(double lon, double lat) {
        HashMap<String, Double> localHashMap = new HashMap<String, Double>();
        if (outofChina(lat, lon)) {
            localHashMap.put("lon", Double.valueOf(lon));
            localHashMap.put("lat", Double.valueOf(lat));
            return localHashMap;
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        localHashMap.put("lon", mgLon);
        localHashMap.put("lat", mgLat);
        return localHashMap;
    }

    // gcj02-84

    /****
     * 火星坐标转地球坐标
     * @param lon
     * @param lat
     * @return
     */
    public static Map<String, Double> gcj2wgs(double lon, double lat) {
        Map<String, Double> localHashMap = new HashMap<String, Double>();
        double lontitude = lon
                - (((Double) transform(lon, lat).get("lon")).doubleValue() - lon);
        double latitude = (lat - (((Double) (transform(lon, lat))
                .get("lat")).doubleValue() - lat));
        localHashMap.put("lon", lontitude);
        localHashMap.put("lat", latitude);
        return localHashMap;
    }
    /**
     * WGS84 转换为 BD-09
     * @returns {*[]}
     */
    public static Map<String,Double> wgs84_to_bd09(double lng,double lat) {
        Map<String, Double> localHashMap = new HashMap<String, Double>();
//        double lat = 31.1784678890;     //纬度
//        double lng = 121.3657210532;    //经度

        //第一次转换
        double dlat = transformLat(lng - 105.0, lat - 35.0);
        double dlng = transformLon(lng - 105.0, lat - 35.0);
        double radlat = lat / 180.0 * pi;
        double magic = Math.sin(radlat);
        magic = 1 - ee * magic * magic;
        double sqrtmagic = Math.sqrt(magic);
        dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * pi);
        dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * pi);
        double mglat = lat + dlat;
        double mglng = lng + dlng;

        //第二次转换
        double z = Math.sqrt(mglng * mglng + mglat * mglat) + 0.00002 * Math.sin(mglat * x_PI);
        double theta = Math.atan2(mglat, mglng) + 0.000003 * Math.cos(mglng * x_PI);
        double bd_lng = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        localHashMap.put("lon",bd_lng);
        localHashMap.put("lat",bd_lat);
        return localHashMap;
    }
    /**
     * 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
     * 即 百度 转 谷歌、高德
     * @param bd_lon
     * @param bd_lat
     * @returns {*[]}
     */
    public static Map<String,Double>  bd09_to_gcj02(double bd_lon, double bd_lat){
        Map<String, Double> localHashMap = new HashMap<String, Double>();
        double x = bd_lon - 0.0065;
        double y = bd_lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_PI);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_PI);
        double gg_lng = z * Math.cos(theta);
        double gg_lat = z * Math.sin(theta);
        // Point point=new Point(gg_lng, gg_lat);
        // return point;
        localHashMap.put("lon",gg_lng);
        localHashMap.put("lat",gg_lat);
        return localHashMap;
    }
    /**
     * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
     * 即谷歌、高德 转 百度
     * @param lng
     * @param lat
     * @returns {*[]}
     */
    public static Map<String,Double> gcj02_to_bd09(double lng, double lat){
        Map<String, Double> localHashMap = new HashMap<String, Double>();
        double z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);
        double theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);
        double bd_lng = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        //Point point=new Point(bd_lng, bd_lat);
        // return point;
        localHashMap.put("lon",bd_lng);
        localHashMap.put("lat",bd_lat);
        return localHashMap;
    };

}
